Malibu fire

Investigators have concluded that the Malibu fire started in the vicinity of a cave, pictured, in Corral Canyon known for being a late-night party hangout. The blaze destroyed 53 homes.

Investigators have concluded that the Malibu fire started in the vicinity of a cave, pictured, in Corral Canyon known for being a late-night party hangout. The blaze destroyed 53 homes. (Ken Hively / Los Angeles Times)